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I just realized this:
So for 100g more you can have all the stats of RoA (Maxed out) minus the mana.

The mana is kind of a big deal for some casters, though, while the slow on Rylai's is pretty meh. I find it works well to grab a RoA early for Amumu, for example, since he's insanely mana hungry early game, and the damage you get from being able to run Despair makes up for the loss of AP in the short run.

Plus, both Rylai's and RoA give very nice stats for caster/tank characters. It seems wasteful to me to pack two Rylai's (since the passives don't stack), so if there's even a chance of me getting both, I'll probably try for a RoA first. RoA first, Rylai's second means your character will be at full power as soon as he gets a Rylai's (or close to), while getting the Rylai's first means you'll still have your fifteen minute build-up time after you get the Rod before you hit max.